Revision as of 18:47, 25 May 2023 by Admin (Created page with "Determine which of the following statements about hierarchical clustering is/are true. <ul style="list-style-type:upper-roman"> <li>The method may not assign extreme outliers...")
May 25'23
Exercise
Determine which of the following statements about hierarchical clustering is/are true.
- The method may not assign extreme outliers to any cluster.
- The resulting dendrogram can be used to obtain different numbers of clusters.
- The method is not robust to small changes in the data.
- None
- I and II only
- I and III only
- II and III only
- The correct answer is not given by (A), (B), (C), or (D).
Copyright 2023. The Society of Actuaries, Schaumburg, Illinois. Reproduced with permission.
May 27'23
Key: C
I is false because the number of clusters is pre-specified in the K-means algorithm but not for the hierarchical algorithm.
II is also false because both algorithms force each observation to a cluster so that both may be heavily distorted by the presence of outliers.
III is true.
Copyright 2023. The Society of Actuaries, Schaumburg, Illinois. Reproduced with permission.